.::: Install Maxscale 25 Trial with license license_key (maxscale: The mandatory parameter 'license_key' is not provided) :::.

 

1. Downlaod Maxscale & license 

https://mariadb.com/downloads/community/maxscale-trial/ 
https://customers.mariadb.com/license/maxscale-trial/

2. Install 
tar -xvf maxscale-25.10.2-trial-release.rocky.9.x86_64.tar

yum install maxscale-common-25.10.2-1.rhel.9.x86_64.rpm -y
yum install maxscale-maxctrl-25.10.2-1.rhel.9.x86_64.rpm -y
yum install maxscale-trial-25.10.2-1.rhel.9.x86_64.rpm -y

3. Try start & enable automatic

[root@teguhth-ha03 data]# systemctl status maxscale.service
× maxscale.service - MariaDB MaxScale Database Proxy
     Loaded: loaded (/usr/lib/systemd/system/maxscale.service; enabled; preset: disabled)
     Active: failed (Result: exit-code) since Wed 2026-04-22 15:28:47 WIB; 2min 23s ago
    Process: 13163 ExecStart=/usr/bin/maxscale (code=exited, status=1/FAILURE)
        CPU: 72ms
 

.::: Command remote access mongodb using mongosh, authenticationMechanism SCRAM-SHA-256, authenticationMechanism SCRAM-SHA-1 :::

 .

https://teguhth.blogspot.com/2024/04/backup-restore-database-mongodb-using.html

1. console admin 

mongosh -u admin -p admin --authenticationDatabase admin

[root@teguhth-all ~]# mongosh -u admin -p admin --authenticationDatabase admin
Current Mongosh Log ID: 69f05c29e551710562d805da
Connecting to:          mongodb://<credentials>@127.0.0.1:27017/?directConnection=true&serverSelectionTimeoutMS=2000&authSource=admin&appName=mongosh+2.8.1
Using MongoDB:          8.0.20
Using Mongosh:          2.8.1
mongosh 2.8.2 is available for download: https://www.mongodb.com/try/download/shell

For mongosh info see: https://www.mongodb.com/docs/mongodb-shell/

------
   The server generated these startup warnings when booting
   2026-04-28T14:01:22.306+07:00: For customers running the current memory allocator, we suggest changing the contents of the following sysfsFile
   2026-04-28T14:01:22.306+07:00: We suggest setting the contents of sysfsFile to 0.
   2026-04-28T14:01:22.306+07:00: We suggest setting swappiness to 0 or 1, as swapping can cause performance problems.
------

test>
 

.::: Read Json file using OPENJSON, OPENROWSET in SQL Server :::.

 

1. copy json sample to disk C:\bcp\teguhth.pembelian.json
 

 

2. only read json 
 

.::: Export MSSQL SQL Server to csv using OPENROWSET :::.

 

https://teguhth.blogspot.com/2025/12/backup-restore-table-sql-server-using.html

https://teguhth.blogspot.com/2026/04/sample-lab-using-openrowset-in.html

1. create excel dummy with header save as "openrowsori.xlsx"
 

2. replace openrows.xlsx (

copy openrowsori.xlsx openrows.xlsx

Karena Excel (via Microsoft ACE OLEDB):

tidak support DELETE
tidak support TRUNCATE
tidak support OVERWRITE

.::: Command Check top service, Top Memory in Linux (Centos 9, Rhel 9, Almalinux 9 include grouping & size memory & count proccess ) Top Process

 

1. total Service group 

ps -eo comm | sort | uniq -c | sort -nr | head

[root@teguhth ~]# ps -eo comm | sort | uniq -c | sort -nr | head
     13 sshd
     10 postgres
      8 nfsd
      5 metricbeat
      4 kworker/R-xfs-c
      4 kworker/R-xfs-b
      4 bash
      3 systemd
      3 filebeat
      2 sort
[root@teguhth ~]#
 

.::: Shell Script Sync Manual Table, Add Column, Alter Column Compare Database (teguhth,aisyah) in MariaDB, MySQL, MarinaDB :::.

 

corelation https://teguhth.blogspot.com/2026/04/create-store-procedure-sync-manual_10.html
https://teguhth.blogspot.com/2026/04/sync-manual-table-add-column-alter_10.html

1. script 

run_sp_compare_table.sh
run_sp_compare_add_column_table.sh
run_sp_compare_alter_column_table.sh

run_sp_compare_table_csv.sh
run_sp_compare_add_column_table_csv.sh
run_sp_compare_alter_column_table_csv.sh

2. run

sh run_sp_compare_table.sh teguhth aisyah
sh run_sp_compare_add_column_table.sh teguhth aisyah
sh run_sp_compare_alter_column_table.sh teguhth aisyah

sh run_sp_compare_table_csv.sh teguhth aisyah
sh run_sp_compare_add_column_table_csv.sh teguhth aisyah
sh run_sp_compare_alter_column_table_csv.sh teguhth aisyah
 

.::: Create Store Procedure Sync Manual Table, Add Column, Alter Column Compare Database (teguhth,aisyah) in MariaDB MarinaDB MySQL :::.

 

correlation https://teguhth.blogspot.com/2026/04/sync-manual-table-add-column-alter_10.html

1. CREATE TABLE (yang belum ada di aisyah)

DELIMITER $$

CREATE PROCEDURE sp_compare_table(
    IN p_source_db VARCHAR(100),
    IN p_target_db VARCHAR(100)
)
BEGIN
    SET SESSION group_concat_max_len = 1000000;

    SET @sql = CONCAT(
    'SELECT 
        CONCAT(
            ''CREATE TABLE ', p_target_db, '.'' , t.table_name, '' ( \n'',
            GROUP_CONCAT(
                CONCAT(
                    ''  '', c.column_name, '' '',
                    c.column_type,
                    IF(c.is_nullable = ''YES'', '' NULL'', '' NOT NULL'')
                )
                ORDER BY c.ordinal_position
                SEPARATOR '',\n''
            ),
            ''\n);''
        ) AS create_table_script
    FROM information_schema.tables t
    JOIN information_schema.columns c 
        ON t.table_schema = c.table_schema
        AND t.table_name = c.table_name
    WHERE t.table_schema = ''', p_source_db, '''
    AND t.table_name NOT IN (
        SELECT table_name 
        FROM information_schema.tables 
        WHERE table_schema = ''', p_target_db, '''
    )
    GROUP BY t.table_name'
    );

    PREPARE stmt FROM @sql;
    EXECUTE stmt;
    DEALLOCATE PREPARE stmt;

END$$

DELIMITER ;
 

.::: Sync Manual Table, Add Column, Alter Column Compare Database (teguhth,aisyah) in MariaDB, MySQL, MarinaDB :::.

 

correlation https://teguhth.blogspot.com/2025/03/query-to-check-table-column-compare_28.html

1. CREATE TABLE (yang belum ada di aisyah)

SELECT 
CONCAT(
    'CREATE TABLE aisyah.', t.table_name, ' ( \n',
    GROUP_CONCAT(
        CONCAT(
            '  ', c.column_name, ' ',
            c.column_type,
            IF(c.is_nullable = 'YES', ' NULL', ' NOT NULL')
        )
        ORDER BY c.ordinal_position
        SEPARATOR ',\n'
    ),
    '\n);'
) AS create_table_script
FROM information_schema.tables t
JOIN information_schema.columns c 
    ON t.table_schema = c.table_schema
    AND t.table_name = c.table_name
WHERE t.table_schema = 'teguhth'
AND t.table_name NOT IN (
    SELECT table_name 
    FROM information_schema.tables 
    WHERE table_schema = 'aisyah'
)
GROUP BY t.table_name;
 

.::: Create Store Procedure Sync Manual Table, Add Column, Alter Column Compare Database (teguhth,aisyah) in SQL Server :::.

 

correlation https://teguhth.blogspot.com/2026/04/sync-manual-table-add-column-alter.html


1. CREATE TABLE (yang belum ada di aisyah)

CREATE PROCEDURE sp_compare_table
    @source_db SYSNAME,
    @target_db SYSNAME
AS
BEGIN
    SET NOCOUNT ON;

    DECLARE @sql NVARCHAR(MAX);
 

.::: Sample lab Using OPENROWSET in Microsoft SQL Server 2025 (read excel csv from sql server) :::.

 

A. prerequirement

1. prerequirement 
Access Database Engine 2016 (x64)

https://www.microsoft.com/en-us/download/details.aspx?id=54920

2. enable access service 
 

3. AKTIFKAN OPENROWSET

Di Microsoft SQL Server:

EXEC sp_configure 'show advanced options', 1;
RECONFIGURE;

EXEC sp_configure 'Ad Hoc Distributed Queries', 1;
RECONFIGURE;
 

.::: Sync Manual Table, Add Column, Alter Column Compare Database (teguhth,aisyah) in SQL Server :::.

 

correlation https://teguhth.blogspot.com/2025/03/query-to-check-table-column-compare.html

1. CREATE TABLE (yang belum ada di aisyah)

SELECT 
'CREATE TABLE aisyah.dbo.[' + t1.name + '] (' + CHAR(10) +
STRING_AGG(
    '    [' + c1.name + '] ' + 
    ty1.name +
    CASE 
        WHEN ty1.name IN ('varchar','char','varbinary','binary') 
            THEN '(' + 
                CASE WHEN c1.max_length = -1 THEN 'MAX' 
                     ELSE CAST(c1.max_length AS VARCHAR(10)) END + ')'
 

.::: Shell script to simulate pararel query thread or Injector CPU in MariaDB :::.

  

1. run run_query_parallel.sh , cpu lebih rendah 

sh run_query_parallel.sh

[root@teguhth-all pararel]# sh run_query_parallel.sh
Jumlah eksekusi (TOTAL): 10000
Jumlah paralel (THREAD): 10
Menjalankan 10000 query dengan 10 paralel...
Query yang dijalankan: 'SELECT *, SLEEP(0.001) as delay FROM pembelian;'
Progress: 10000/10000 (100%)
Selesai semua eksekusi.
[root@teguhth-all pararel]# 

::: Simalation Locking, Blocking & Deadlock in SQl Server MSSQL, LCK_M_S(locking), LCK_M_X(Blocking Deadlock) :::.

 

Mantap ini contoh tabel kamu sudah pas untuk bikin simulasi.
Saya buatkan 3 skenario nyata di SQL Server: locking ? blocking ? deadlock (step-by-step, tinggal kamu jalankan di 2 query window / session).

1. SIMULASI LOCKING

Session 1 (Window 1) (session 64 sa)

SELECT @@SPID as session_id;
BEGIN TRAN;
UPDATE pembelian 
SET JUMLAH_PEMBELIAN = 10 
WHERE KODE_PEMBELIAN = 'BEL-E001';
 

Session 2 (session 60 sa)